Demon Ruler: The Over-Leveling of a Man Who Just Wants to go Home on Time

Power harassement, unpaid overtime, no girlfriend...Wataru Gojo is an office worker in his mid-thirties who's life is filled to the brim with stress. On a whim, he decides to install a new game on his phone called "Demon ruler". As soon as he does, a cute butterfly girl in a shrine maiden outfit comes out of his phone! She says she is a demon and that he can earn money by defeating other demons in the spirit world!? Could it be that Gojo just found the perfect way to relieve some of that stress?